Although the study of comparative law, or rather the study of foreign legal systems in a comparative manner, is in general of academic rather than practical value, except in so far as it gives us insights into the ideas, attitudes and procedures of our own legal system, yet for those who are concerned, as practitioner, judge or student, with certain types of legal system the position is radically different; I refer to legal systems in which internal conflicts of law arise. In such systems the judge is faced, constantly or even daily, with situations which require him, not merely to choose between one system and another as the appropriate one for the decision of the instant case, but to perform a running comparative interpretation, classification or analysis of the institutions of two or more legal systems, which must somehow be brought into harmony (one might aptly use the metaphor of meshing gears here). The part that a rule or a feature of one legal system plays in its functioning total legal complex must be understood, and the rule or feature must be properly characterised so as to permit it to be translated into another legal system which is administered concurrently with the first.